Memory corruption via negative UTF-8 output length
Published Jan 27, 2026 · Updated Jan 27, 2026
Out-of-bounds write in OpenSSL 1.1.1 and 3.0 through 3.6 allows attackers to corrupt memory via a crafted PKCS#12 file. The OPENSSL_uni2utf8() second pass gives UTF8_putc() the remaining UTF-16 source bytes as output capacity; a three-byte character can return -1, making the length negative before a trailing NUL is stored. An application must call PKCS12_get_friendlyname() on attacker-controlled input; the primitive is one zero-byte write before a heap buffer and can crash the process.
Summary
What happened
Out-of-bounds write in OpenSSL 1.1.1 and 3.0 through 3.6 allows attackers to corrupt memory via a crafted PKCS#12 file. The OPENSSL_uni2utf8() second pass gives UTF8_putc() the remaining UTF-16 source bytes as output capacity; a three-byte character can return -1, making the length negative before a trailing NUL is stored. An application must call PKCS12_get_friendlyname() on attacker-controlled input; the primitive is one zero-byte write before a heap buffer and can crash the process.
The record
- CVE
- CVE-2025-69419
- Published
- Jan 27, 2026
- Updated
- Jan 27, 2026
- Vendor
- OpenSSL Project
- Product
- OpenSSL
- Classifications
- CWE-787
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 27, 2026CVE publishedPublication date reported by the CVE source.
- Jan 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.1.1 <1.1.1ze
- Affected versionversion=3.0.0 <3.0.19
- Affected versionversion=3.3.0 <3.3.6
- Affected versionversion=3.4.0 <3.4.4
- Affected versionversion=3.5.0 <3.5.5
- Affected versionversion=3.6.0 <3.6.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Technologies
Your stack
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Your stack
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